class Test000
{
    boolean command(boolean input) 
    {
	boolean ret = false;
	if (input)
	    {
		ret = true;
	    }
	else { System.out.println("=> Warning, invalid argument."); }
	
	return ret;
    }

    /**
Should be rather rewritten as:
    boolean command(boolean input) 
    {
	if (!input) 
	    {
	        System.out.println("=> Warning, invalid argument.");
	        return false;
	    }

	return true;
    }
or even (in this simple case):
    boolean command(boolean input) 
    {
	if (!input) System.out.println("=> Warning, invalid argument.");

	return input;
    }
     */
}